#app{
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #111111;
  min-height: 100vh;
}

.board{
  display: flex;
  flex-wrap: wrap;
}

.square{
  width: 16px;
  height: 16px;
  margin: 2px;
  background-color: #1d1d1d;
  box-shadow: 0 0 2px #000;
  transition: 2s ease;
}

.square:hover{
  transition-duration: 0s;
}